ANSWER:

This is totally prohibited as this fixed profit is riba and one of the major sins in Islam. Besides, you don’t know what they had used your money in selling or whether they sold anything or simply deposited and took interests on it from a bank. 

QUESTION: My question: amazon has an app (Smart Store) we deposit an amount in their account/app. Amazon sells products worth that amount of th we deposit and will pay us 3% profit everyday (eg. On 100 dollars everyday amazon will pay 3 dollars and at the end of day will have 103 dollars in our account). Is this Halal or Haram ?

Riba |